POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is the basic syntax for a DELETE statement in PostgreSQL?

Can you explain what happens if you omit the WHERE clause in a DELETE statement?

What is the purpose of the RETURNING clause in a DELETE statement?

How can you delete rows from a table that are referenced by another table via a foreign key?

Explain the concept of a self-referential delete and how you would handle it.

What are the implications of deleting rows in terms of database performance and fragmentation?

How can you ensure data integrity when deleting rows from a table involved in complex relationships?

Describe a scenario where a DELETE operation might fail due to constraints and how you would resolve it.

How would you perform a soft delete in PostgreSQL and why might it be preferable to a hard delete?

Discuss the considerations and best practices for deleting large volumes of data in a production PostgreSQL environment.

PostgreSQL: How can you find and delete duplicate records in PostgreSQL?

How can you use a Common Table Expression (CTE) to delete duplicate records in PostgreSQL?

How can you find and delete duplicates based on partial matching of columns in PostgreSQL?

How can the DISTINCT ON clause help when deleting duplicate records?

How can you prevent duplicates from occurring in a PostgreSQL table?